[prev in list] [next in list] [prev in thread] [next in thread] 

List:       xmlbeans-dev
Subject:    [jira] [Created] (XMLBEANS-478) NullPointerException in SchemaType.getEnumJavaClass
From:       "Martin McCallion (Created) (JIRA)" <xmlbeans-dev () xml ! apache ! org>
Date:       2012-01-27 15:00:11
Message-ID: 903807153.254.1327676411649.JavaMail.tomcat () hel ! zones ! apache ! org
[Download RAW message or body]

NullPointerException in SchemaType.getEnumJavaClass
---------------------------------------------------

                 Key: XMLBEANS-478
                 URL: https://issues.apache.org/jira/browse/XMLBEANS-478
             Project: XMLBeans
          Issue Type: Bug
          Components: XmlObject, XPath
    Affects Versions: Version 2
            Reporter: Martin McCallion
            Priority: Minor


I have code like this, where currentElement is an XmlObject:

        // Check whether we're dealing with an enumeration.
        Class fieldClass;
        SchemaType t = currentElement.schemaType();
        if (t.getEnumJavaClass() != null)  // According the JavaDoc, should return \
null if it's not an enum.  {
            fieldClass = currentElement.schemaType().getEnumJavaClass();
        }
        else
        {
            fieldClass = currentElement.getClass();
        }


This throws a NullPointerException as follows:

[27/01/12 14:02:27:526 GMT] 00000030 SystemOut     O E Exception caught within struts
java.lang.NullPointerException
	at org.apache.xmlbeans.impl.schema.SchemaTypeImpl.getEnumJavaClass(SchemaTypeImpl.java:1835)
  at com.misys.meridian.runtime.message.XmlMessageImpl.setFieldValue(XmlMessageImpl.java:711)
  at com.misys.meridian.runtime.message.XmlMessageImpl.setField(XmlMessageImpl.java:950)
  at com.misys.meridian.runtime.message.XmlMessageImpl.setField(XmlMessageImpl.java:989)
                
...

I found source for SchemaTypeImpl here: \
http://www.docjar.com/html/api/org/apache/xmlbeans/impl/schema/SchemaTypeImpl.java.html. \
The method in question looks like this (line numbers provided at that link):

 1829       public Class getEnumJavaClass()
 1830       {
 1831           // This field is declared volatile and Class is immutable so this is \
allowed.  1832           if (_javaEnumClass == null)
 1833           {
 1834               try
 1835                   { _javaEnumClass = \
Class.forName(getBaseEnumType().getFullJavaName() + "$Enum", false, \
getTypeSystem().getClassLoader()); }  1836               catch \
(ClassNotFoundException e)  1837                   { _javaEnumClass = null; }
 1838           }
 1839   
 1840           return _javaEnumClass;
 1841       }
 
 Line 1835 could NPE if getBaseEnumType() returns null.  And indeed, elsewhere in the \
same class we see:

1465       public SchemaType getBaseEnumType()
 1466       {
 1467           return _baseEnumTyperef == null ? null : _baseEnumTyperef.get();
 1468       }

Which suggests that that is exactly what's happening.

It is, of course, possible that I have done something wrong in creating my generated \
classes, such that they are missing some necessary data.  But if that is so, there \
ought to be a more informative Exception.  And note that the classes were generated \
using scomp from an ISO20022 schema.

I'm working around this by checking for a null return on getEnumerationValues() \
instead.





--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: \
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more \
information on JIRA, see: http://www.atlassian.com/software/jira

        

---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@xmlbeans.apache.org
For additional commands, e-mail: dev-help@xmlbeans.apache.org


[prev in list] [next in list] [prev in thread] [next in thread]